Device for tying thread ends in winding frames or other textile machines



May 30, 1944. F RST FRAMES OR OTHER TEXTILE MACHINES Filed Feb. 18, 1941 8.13 DEVICE FOR TIEING THREAD ENDS IN WINDING Patented May 30, 1944 UNITED STAT 2,349,953 DEv1cE FOR 'rrmo THREAD ENDS IN WIND- ING FRAMES CHINES OR OTHER TEXTILE MA- Stefan Fiirst, Gladbach-Rheydt, Germany; vested in the Alien Property Custodian Application February 18, 1941, Serial No. 379,542 In Germany July 14, 1939 Claims. (01. ass-2i;

In order to tie the ends of the running on and running off threads together by a weavers knot,

it has heretofore been the practice to start 'by forming one of the ends to be tiedinto a loop-with crossed arms. This loop was then laid around a support shiftable in its axialplane and an auxiliary loop was formed by means of athread guide through which auxiliary loop the other thread end was pulled. The thread guide was thenmoved out of the first auxiliary loop "with formation of another auxiliary loop without crossing of the thread arms, whereupon theauxiliary loop was undone and the knot pulled together after the tie has been liberated by the supporting element.

This tying procedure was very complicated and accordingly the arrangement for carryingit out mechanically was also.

Accordingto the invention the tying procedure is considerably simplified, so that the knotted bills generally used successfullyin hand-operated implements can be used for carrying it out.

The tying proceeding takes place, according to the invention, in thatth-e threads are laid noncrossed into the bend of the knotter billsof a knot forming device, with their ends pointing in opposite directions, the bights and ends --of the twothreads being held in such position in relation to the plane of revolution of the knotter bills, that the latter, on carrying out a three-quarter rotationgrip behind the thread parts lying on one side of the knotter shaft and pass between the thread parts lying on the other; side, so that two thread loops are formed, whereupon during a further semi-rotation of the knotter 'bills the latter ,open and grip the end of one of the threads and finally cut off this end during a further quarter-rotation and clamps the same while the other thread end is cut off by scissors and finally the tie is pulled off the knotter bills. I

The bight of the thread which is, engaged to strip the tie off the knotter bills is preferably temporarily clamped, according to the invention, during the stripping operation, and'the pull is exerted by means of a separate element moved against the thread between the clamp and the knotter bills. v

The employment of knotter bills, orthe construction employing coordinated thread slits and clamps, for tying a weavers knot, according to earlier practice, depended onthe condition, that the ends of the torn thread had to b laid in the knotter mechanism pointing. in the same direc tion,,in order to producethe knot. Ifone had tried to form a weavers knot in the usual mannor of operation, with ends of the thread point-,

'ing to difierent sides Figs. 1 to 5 are diagrammatic views of a knotter device and threads, showing the main phases of the tying procedure,

Figs. 6 and 7 show the knotter in a central section approximately on line VIVI of Fig. 9, its elements being in diiferent positions,

Fig. 8 shows a partial top plan view, in the direction' of the arrow VIII in Fig. 6,

Fig. 9 is a vertical transverse sectional view on the line IX-.IX of Fig. 6, showing the mounting of the pivot bolt of the stripping member,

' Fig. 10 is a detail vertical section on the line X-X of Fig. '7, showing the final step of the knotting procedure. I

The knotter mechanism is mounted between two side walls I and 2 having a general shape common in knotters." ported upon an arm 3 of a carriage, for example, by means of a transverse plate 34 fixed to the arm 3 by screws 35. A knotter shaft 4 is journalled at its rear end in the plate 34 and at its front end in a bearing 36 carried by a crossbar 31 (Fig.8) The front end of the knotter shaft 4 is bent away at approximately a right angle to form one of the knotter bills 38. The other knotter bill 39 is pivoted to the shaft 4 at Ml. The knotter bill 39 has a tail portion 5 which is received within'a cam rin 30, forming part ofthe crossbar 31, the cam ring being positioned eccentrically with respect to the axis of theknhtter shaft 4. Thus: the pivoted knotter bill 39 is oscillate d as theknotter shaft 4 rotates. A shear blade 6 is fixed to the knotter shaft 4 and coacts with the bill 5. to sever one of the thread ends in. customary manner.

The driving part of the knotter shaft disin thetform of a flat bar twisted into a screw and is engaged by theupper end of an actuating lever l which liesifiat against the bar 4, as shown in Fig. 9. The actuating lever l is pivoted to a shaft 23 supported between the sidewalls l and 2. Counterclockwise rocking of the actuating lever 1 causes the knotter shaft 4 to execute a forward rotation of at least one and one half revolutions and the clockwise rocking ofactuating lever 1 ,back tostarting position causes a reverse move- The knotter may be sup end to the shoulder of bolt 22 and tendsto hold the stripping hook Bnormally in the position shown in Fig. 6. A lug 46 on the actuating lever l is adapted to engage a cam 8d on the stripping hook 8 as the actuating lever nears theer d o f its forward movement, throwing the stripping I hook down to the position shown in Fig. 7. In this position of the stripping hook a pin 20 thereon, of angular cross section, is engaged bye-re;

'l' 'pivotally taining member in the form of a pawl supported on shaft 23 and urged downwardby a spring 24 toward a stationary pin 48 wall 2. V pin 20 toward the end of the return movement of the actuating lever 7, by engagementofthelatter with a lug 49 on the upwardly extending arm .of thepawl l9. r k v A defiectingbar H is rockably mounted on a transverse shaft l0, and has at its front enda" notch l2 to coact with oneof the thread; ends inv a manner to be described. At its rear end thedefleeting bar has a cam surface Ha coacting with a pin 9 on the actuating lever l, to cause a rocking' movement of the deflecting bar near the end of the movement of the actuating lever. H

Pivotally supported on a transverse shaft 50 is a notched bar l4 having a horn 3| to position two of the thread parts ina manner. to be described. The notched bar His-extended at (Fig. 8) in the form of a bail and at the end of this ball is a blade 52 forming part of a shears S, the other blade 53 of which is constituted by one end of a spring bail l5 fixedly mounted on the shaft 50. Also mounted on the shaft 50 is a plate comprising a clamping jaw I6 which coacts with the horn 32 of the notched bar {4 to clamp a part of one of the threads in a manner to be described. The plate bearing the clamping jaw I 6 has a downwardly extending lug 16a which is normally held against a stop pm Hi by a coil spring ll, one end of which is hooked over the lug [6a, while the other end is hooke'dinto the blade 52 of the bail 5!. An arm 54 of the notched bar M has a slotted end 55 in which a pin deflecting bar ll engages. I

The side plate I is provided witha ho1'1i'3l between two notches 3m and 311), which are adapted to hold parts of the two threads in a manner to be described. The horn 3|is omitted from Fig. 6 to avoid confusion and the contour of the side wall I is consequently indicated'inidot and dashlines. f The knotter is operated to tie a weavers knot" in the following manner: With the mechanism standingin the normal position shown in Fig. 6, the two threads to be tied together are laid across the knottershaft 4 behind the knotter bills 38, 39, uncrossed, with their ends extending in opposite directions from the knotter shaft, as shown Fig. 1. The-first thread, I d, is laid in position-with itsbightb between the horn 32 and the clamp jaw 16 and its end tl placed in the notch 3la and between the blades of the shearsS. The second thread, a, c, is laid with its bight in the notch M2) and its end behind the horn 32. It will be observed that the bight b and end d of the first thread are both extended forward of the plane of revolution wy' of the knotter bills, while the end 0-01" the second 1 thread is extended forward of saidplan of revoonithe side The retaining pawl is released from lution and the bight a of the second thread is extended rearward of the plane of revolution. Therefore, when the knot forming device, comprising the knotter shaft 4 and knotter bills 38, 39, executes its first quarter revolution (Fig. 2) the knotter bills engage over the bight b of the first ithread and' the end c of the second thread, while-on the next half revolution (Fig. 3) the knotter bills pass between the end d of the first thread and the bight a of the second thread. This causes a crossed loop to be formed in the first thread around the knotter bills and an uncrossed loop to be formed in the second thread. The knotter bills are open during the first part of their first revolution (Fig. 2), but this is with- Outsig'nificance, because no part of the threads ,iseernbraced by them at the time. During the asth'knotter bills the actuating lever I normal position it engages thelug 49 of the respring 2|.

, of-the knotter shaft as nexthalf revolution following the position shown in Fig. 3 the knotter bills are cammed open and arrive'at the position shown in Fig. 4. Meanwhile, the pin 9 of the actuating lever 1 has reached the left. end of the cam surface Ha and has rocked the deflecting bar] I up from its position shown in Fig. 6. The thread end 0 lying in the notch i2 is thrust over into the plane ofrevolution of the The rockingof the. .defiecting bar H causes the notch bar 14 to be. 1"ocked up against the clamp bar 16, thusclampin the bight b of the first thread. moved up and severs the end def the first thread,

Finally, the stripping hook 8 swings down,;under theaction of the actuating lever upon its cam 8a,

and engages theIbight b of the first thread between the clamp I 4 Upon further movement of the hook 8 the loop of 4, l8, and the knotter bills.

pinghook 8 draws the knot tight. The outer part of the end 0 is severed by the shear blades 5 and 6 close. v I

. At the lower-limit of its movement'the-stripping hook 3 is caught by the retaining pawl 19 andheldthere durin most of the return movement'of the other parts of the knottermechataining'p'awl I 9 and releases the stripping. hook 8, which is thrown up to the position of Fig. 6 by its Althoughthe form of te'i as shown is'intended in the first instance for winding frames, the

thereto, but may be applied anywhere in textile machines, when thread ends" have to be-knotted as. for instance also in warping mechanically, machines.

jWhatI claim as my invention and desire jto' secure by Letters Patent of' the United States is: for tying together two threads in'a weavers knot, a knot forming device L'In a mechanism comprising a rotary knotter shaft andknotter bills extending laterally therefrom so as to travel in a 1 plane of revolution fromsaidknotter shaft; said holdingmeans com prising means to hold the endand the bight'of knotter bills and thus in position to, begrasped bythe latter, a indicated in Fig. 4.

Also, theblade52 of the shears S is approaches its construction of the knot v invention is not .limited perpendicular to the axis the latter rotates; means located at opposite sides of said knotter shalft for bights of two threadstlaid.

the first thread extended forward of said plane of revolution on opposite sides of said knotter shaft, means to hold the end of the second thread extended forward of said plane of revolution adjacent the bight ofsaid first thread, and means to hold the bight of said second thread extended rearward of said plane of revolution on the same side of said knotter shaft with the end of said first thread; means to 'revolve said knot forming device through at least one and one half complete revolutions insuch direction that the knotter bills thereof first engage over the bight of said first thread and the end of said second thread, then pass between the end of said first thread and the bight of said second thread whereby said first thread is formed into a crossed loop and said second thread is formed into an uncrossed loop on said knotter bills; means tohold said knotter bills open during a part of their movement following their first complete revolution and then to close them; deflecting means to move the end of said second thread over said uncrossed loop and into said plane of revolution, so as to be grasped by said knotter bills during said lastmentioned portion of their movement; and means to strip said loops from the knotter bills, so that said crossed loop passes over the end of said second thread held in the grasp of the knotter bills.

2. A knot tying mechanism as described in claim 1, wherein clamping means are provided to engage the bight of said first thread and said stripping means is adapted to engage the bight ofsaid first thread between said clamping means and sai knotter bills.

3. In a mechanism for tying together two threads in a weavers knot, a knot forming device comprising a rotary knotter shaft and knotter bills extending laterally therefrom so as to travel in a plane of revolution perpendicular to the axis of the knotter shaft as the latter rotates, means located at opposite sides of said knotter shaft for holding the ends and bights of two threads laid across said knotter shaft behind said knotter bills, with their ends extending in opposite directions from said knotter shaft, said holding means comprising a side wall at one side of said knotter shaft having two notches therein adapted to receive, respectively, the end of the first thread and the bight of the second thread and to hold the same extended divergently from said knotter shaft forward and rearward, respectively, of said plane of revolution, said holding means also comprising a clamping device, one member of which is provided with a horn for positioning the bight of said first thread and the end of said second thread so that both extend forward of said plane of revolution; means to revolve said knot forming device through at least one and one half complete revolutions in such direction that the knotter bills thereof first engage over the bight of said first thread and the end of said second thread, then pass between the end of said first thread and the bight of said second thread, whereby said first thread is formed into a crossed loop and said second thread is formed into an uncrossed loop on said knotter bills; means to hold said knotter bills open during a part of their movement following their first complete revolution and then to close them; deflecting means to move the end of said second thread over said uncrossed loop and into said plane of revolution so as to be grasped by said knotter bills during said last-mentioned portion of their movement; means to close said clamping means upon the bight of said first thread as said deflecting means is operated; and means acting upon the bight of in a plane of revolution perpendicular to the axis of-theknotter shaft as the latter rotates; means located at opposite sides of said knotter shaft for holding the ends and bights of two threads laid across said knotter shaft behin said knotter bills, with their ends extending in opposite directions from said knotter shaft; said holding means comprising means to hold the end and the bight of the first thread extended forward of said plane of revolution on opposite sides of said knotter shaft, means to hold the end of the second thread extended forward of said plane of revolution adjacent the bight of said first thread, and means to hold the bight of said second thread extended rearward of said plane of revolution on the same side of said knotter shaft with the end of said first thread; actuating means having a forward and reverse movement to revolve said knot forming device at least one and one half complete revolutions and back to starting position, said knot forming device being revolved during the forward movement of said actuating means in such direction that the knotter bills thereof first engage over the bight of said first thread and the end of said second thread, then pass between the end of said first thread and the bight of said second thread, whereby said first thread is formed into a crossed loop and said second thread is formed into an uncrossed loop on said knotter bills; means to hold said knotter bills open during a part of their movement following their first complete revolution and then to close them; deflecting means moved by said actuating means to thrust the end of said second thread over said uncrossed p and into said plane of revolution, so as to be grasped by said knotter bills during said last-mentioned portion of their movement, stripping means operated by said actuating means to strip said loops from the knotter bills, so that said crossed loop passes over the end of said second thread held in the grasp of the knot ter bills, retaining means adapted to catch said stripping means and holding the same in actuated position, and means whereby said retaining means are released by said actuating means just before the latter completes its reverse movement.

5, In a mechanism for tying together two threads in a weavers knot, a knot forming device comprising a rotary knotter shaft and knotter bills extending laterally therefrom so as to travel in a plane of revolution perpendicular to the axis of the knotter shaft as the latter rotates, means located at opposite sides of said knotter shaft for holding the ends and bights of two threads laid across said knotter shaft behind said knotter bills, with their ends extending in opposite directions from said knotter shaft, said holding means comprising a side wall at one side of said knotter shaft having two notches therein adapted to receive, respectively, the end of the first thread and the bight of the second thread and to hold the same extended divergently from said knotter shaft forward and rearward, respectively, of said plane of revolution, said holding means also comprising a clamping device, one member of which is provided with a horn for positioning the bight of said first thread and the end of said second i said first thread between said clamping-means for tying together two'- of revolution; means to revolve said "knot forming evice 'throughatyleast one and one half complete revolutions in such direction thatthe knotter bills thereof first engage over thebight of said first thread ;and the endof said second thread, then pass between the, end of saidfirst thread and the bight of said second thread, whereby said first thread is formed into a crossed .loop and said second thread is formed into an uncrossed loop on-said knotterbills; means to hold-said ,knotter bills open during a part of their movement following their first; complete revolution and then to close them; deflecting means to move the end of said second thread over said uncrossed loop and into said plane of revolution so thread so that both extend forward ofsaid plane l as to be grasped by said knotter bills during said last-mentioned portion of their movement; means to closesaid clamping means upon the bight of said first thread as, said deflecting means is operated; acutting device comprising two shearing STEFAN FfiRST. 

